Releasing threading die



May 19, 1931'. T, QOTTER 1,805,905

RELEASING THBEADING DIE Filed March 1. 192.9

Patented May l9, 1931 TnoinAs Coraline, or EvA svI Ln, INDIANA fl R EAS GQe E i ID E App-lieati'on fi l ed mm; 1 1529. Serial 110.343,?94.

Inthe use of the ordinary threading die, when thethread has been cut on the rod; bolt,-or the like, it is necessary to continue to reverse the direction of turning of thedie 5 stock until the'diehas completely-backed olf of the screw thread which it has previously formed, which requires time. r

The obj ect-of my invention is to provide an improved threading die stock wherein the 10 die will automaticallytilt and expand when released, thus freeing itself from the screw threads which have been out, enabling the die stock to be quickly removed.

A further object is to provide an automat- It ically releasing threading die which can be quickly restored to norma-lthreading condi tion after it has released from the screw thread which has been cut.

The foregoing objects are accomplished by the provision of an expansible screw threading die, an improved stock, and iInproved means on the stock whereby the die may be contracted and held in screw threading condition, or, allowed to tilt and to expand to free itself from the screw thread which has been cut. a

While the invention is not to be considered as limited to the specific embodiment hereinafter described and which is shown in the to accompanying drawings, a practical embodiment is the one shown and described wherein one of the sections of the die is springexpanded in relation to the other section thereof, the entire die and its holder or plates are contained within an improved stock in which the die and its plates may tilt from a normal contracted condition to an abnormal expanded condition, and a combined camming and locking device for contracting the die and forcing it into contracted, screwthreading, position and retaining it in that position, is provided.

In the accompanying drawings:

' Figure 1, isa front view of the die and stock in threading condition;

Fig. 2, is a cross section showing the die in threading condition and illustrating a threaded bolt;

Fig. 3, is a similar view showingthe die in tilted position, freed from the threaded bolt;

7 Fig. 4, isan edge View of the die an plates, removed from the stock;

, Fig.5, is a front View thereof; j Fig. 6, is an edge view of one of the rings; Fig. 7, is a front view thereof; and j Fig. 8, is .an internal view of the die, the

ring being removedv to show the expanding springs.

d its The die stock is shown, generally,j at 1',

being provided with the usual' handles by which it maybe turned. The stock has die receiving cavity 2 which differsfrom the usual construction 'in'that it i's of greater width than the thicknessof the die and the plates for' the die so that theidieand its plates may tilt from the normal position shownjin Fig; '2 to the abnormal position shownin Fig. 3. 7 There "is a supplementaljchamber 2"in-the die holder oristock which permits tilting of the die when desired, thus'enablin thedie to automatically expand. 1 One'orj both wallsfof the" chamber 2 may be I removable but in the p'resent instance one wall 3 isintegral with'the die stock, the other wall comprising a. removable ring 4 secured by screw s5 and having mug orpin 6 projecting into the cavity 21at a, point diametrieally oppositeto the supplemental chamber or cavity 2, the purpose of the lug'o'r pin'6 being to serve as a fulcrum so that the die will tilt and'bejpermittedto. expand after the-threadhas been cut and the operator wishes to {release the, die so that it; may "be? removedfrom' the cut thread. v I" The die comprises a fixedsection 7 and an expanding section 8. carried by the usual parts 9; Interposedb'etweenfthe sections 7 and 8 are expansion springslO surroundingypinsconnectedto one ofsai'd sections. Thesec-f tion 8 has arounded mite edge l lwhichis adapted to enter-the supplemental cavity 2,- when-thedie is tilted and whichwipes under the top of the cavity 2 andcontracts the die into cutting condition when the die is in nor:

malposition. The parts of the die are'held in place by rings 12,13, secured to said parts a 9 by the screws 14 andtherejis the usualring 15'which fits in the opening in-the-integra'l wall 3; The'expansible sect-ion'8 has acavity' orslot ldwhich receives apin 17 carried by the ring or plate 13 for the purpose of limiting the extent to which the springs 10 may expand the die section 8. The ring 13 is provi ed with a bevelled notch 18 in the region of the bevelled or rounded part 11.

There is a latch handle 19 which is connected at 20 to the stock land may beheld down by a bail or keeper 20;:pivoted'to a handle of the stock. Secured at 21 to the latch handle 19 is a latch 22 which has a bevelled end 23.

The latch 22 is adaptedto be entered into the supplemental cavity 2 when the handle 19 is depressed, thereby to engage the rounded or bevelled part 11 of the die section 8 and to enter the notch 18 for the purpose of' holding the die in its normal screw threading position. If, the keeper 20 is engaged with the handle 19, the die will be retained in normal position in the cavity 2 and can be used for screw threading purposes.

If, however, the handle l9-be released from the keeper 20' and the die stock tilted on the work, the pin 6 will act as a fulcrum and the springs 10willcause the die section 8 to ex pand intothe cavity 2. The cavity 2 is provided with, a bevelled wall 24 to facilitate this operation and also the operation of restoring the die to. normal position.

Thenormal position'of the die appears in i Fig, 2 and the released or expanded condition in Fig. 3. In each instance, a. threaded bolt 25 is shown to illustrate the position of the parts during a screw threading operation and theposition thereof afterthe threadhas been cut and the die has expanded to disengage its teeth from the bolt and to enable the die and the stock to, be quickly removed from the bolt because, theteethof the die are clear of' the screw threads, on the bolt.

7 ,What I claim is:

1, In a releasing threading die, the combination with a die stock having a chamber for containing the die, of an expansible threading die located within said chamber andheld in contracted, screw-threading condition by the walls of the chamber, said chamber being of a width permitting the die to bodily tilt therein and having asupplemental cavity or enlargement which permits the die. to expand when said die is tilted, thereby to permit the die to open.

2.v In a releasing threading die, the combination with a die stock having a chamber for containing the die, of an expansible threading die located within saidchamber and held in contracted, screw-threading condition by the walls of the chamber, said chamberbeing of 'a width permitting the die to bodily tilt,

therein and having a supplemental cavity, or

: enlargement whichpermits the die to expand when said die is tilted, thereby to permit the die to open, and manually operable means for bodily shifting the die from expanded position into the chamber to effect contraction of 05' the die and to maintain it in contracted position, said manually operable means, when released from the die, permitting the die to bodily tilt in the chamber and to project into the supplemental cavity so that the die may expand.

3. In a releasing threading die, the combination with a die stock having a cavity and provided with; a fulcrum, ofa threading die having relatively expansible parts and spring means for relatively expanding said parts when freed, a movable part of the die being providedwith a cam surface, said die being adaptedto assume a normal contracted position in the cavity or a tilted expanded position therein, said fulcrum serving to tilt the die when the dieis released, anda latch adapted for manipulation at will, which co-operates; with, the cam surface of the die for the purpose of forcing the die into threading position, said latch then looking the die, in that position,

Intestimony whereof I affix my signature.

THOMAS. CUTTER. 

